Fluid pump



Aug. 6, i945, l T. D. NlsBET 254059322 Patented Aug. 6, 1946 UNITED STATES PATENT OFFICE FLUID PUMP Thomas D. Nsbet, Rocky River, Ohio Application July 10, 1945, Serial No. 604,244

My invention relates in general to fluid pumps and more particularly to fluid pumps adapted to be mounted on a container for transferring the fluid in the container to a vessel or other container.

' An object of my invention is the provision of a 'pump having two independently operable pistons Within a cylinder in which' the pistons may be actuated toward and away from each other by an actuating lever which may be actuated back and forth through an angle less than 180 degrees.

Another object of my invention is the provision of a pump having an L-shaped actuating lever whereby theA pump may be directly mounted upon a container without the actuating lever contacting or engaging the container on which the pump is mounted. l

Another object of my invention is the provision of a pump having two independently operable pistons within a cylinder in which the pistons are actuated by a rocker which oscillates through an angle less than 180 degrees.

Another object of my invention is the provision of a pump having two independently operable pistons within a cylinder, in which the pistons move toward and away from each oth'er and in which the movement of the pistons is maintained substantially in a straight line motion.

Another object of my invention is the provision of a bracket for aligning a rodwhich actuates one of the pistons substantially co-axial of the cylinder, the said rod also functioning as a slidable guide rod for the movement of the other piston.

VAnother object of my invention is th'e provision of mounting one of the pistons upon a, sleeve which slidably engages the rod that actuates the other piston.

Other objects and a.' fuller understanding of my invention may be had by referring to the following description and claims, taken in conjunction with the accompanying drawing, in which:

Figure 1 represents a side elevational View of a pump embodying th'e features of my invention and is shown as being mounted upon a fluid container;

Figure 2 is a longitudinal cross-sectional View of my pump, the section being taken along the line 2-2 of Figure 3; and

Figure 3 is a view of my pump taken along the line 3 3 of Figure 2 with the rocker and the connecting links omitted for the purpose of clarity.

One useful employment of my pump is that of transferring liquid such as gasoline or voil from 11 claims. (C1. 10a-200) the original shipping or delivery container into another tank or Vessel, and particularly where little suction or head pressure is required. These types of pumps are usually referred to as transfer pumps. One of the most common type of transfer pump found on the market is operated by a crank involving a rotary principle and thus requires a considerable amount of space or room between the pump body and the fluid container whereby a full swing of the crank may be made.

In order to provide this space or head room, aV

pipe nipple is used toelevate the pump body away from the uid container which precludes the screwing of th'e pump body directly into the drum or container.' In my invention, the pump body may be screwed or attached directly to the uid container from which fluid is to be pumped.

With particular reference to the drawing, the reference character I0 represents a fluid container from which fluid such as gasoline or oil is to be transferred. As shown in Figure 1, my pump which is indicated by the-reference character II is connected directly to the top of the container I0 and is adapted to be actuated by a manually operable lever V36 which is rocked back and forth to produce the pumping operation.

With reference to Figure 2, my pump comprises an intake housingIZ, a discharge housing I3 and a cylinder I4 mounted therebetween. Th'e discharge housingl3 is provided with an annular shoulders 24 and 25 and are firmly held therein by the connecting bolts 26 which extend between the discharge housing I3 Vand the intake housing I2. When the connecting bolts 26 are turned down tight a good sealing engagement is made between the end 0f the cylinder I4 and the annular stepped'shoulders 24 and 25. A discharge conduit I5 may be threadably connected to the discharge housing I3, and as the pump is operated the iiuid which is being pumped is discharged out through the discharge conduit I5 into another vesselor container. An intake conduit I6 may be threadably connected to the bottom of the intake housing I2 and when the pump is in operationth'e intake conduit I 6 extends down into the container I0 for conveying liquid to the intake housing I2. Although not shown, a ball check valve maybe placed immediately in the intake housing I2 above the intake conduit I6 to prevent the return of the flow of liquid to the container. However, I nd from actual operation that my pump produces a sufficient vacuum so that for ordinary purposes th'e ball check valve may be dispensed with, particularly where little fluid suction or vacuum is required to elevate the liquid from the container to the pump. However, where the head pressure or suction becomes great it is preferable to employ a ball check valve in the intake housing I2 above the intake conduit I6. As illustrated in Figure 2, the lower end of the intake housing l 2 is provided with two stepped threaded portions I1 and I8 "whereby my pump may accommodate threaded openings in the container of diierent sizes. ping or delivery containers or drums as now found on the market have two sizes of threaded openings and thus if my pump is to be connected to a container having a small opening then the Original ship-j.

fil

from disengagement with the rocker arm 35. Similarly, the lower end of the connecting link 34 is provided with a right angle portion which 'extends through an opening in the left-hand end of the rocker arm. A cotter key 44 is employed to keep the connecting link 311 from becoming disengaged with the rocker arm 35. The upper ends of the connecting links 33 and 34 are respectively provided with right-angle portions for fitting, respectively, in the openings provided, in the actuating lugs 32 and 3l. Cotter keys need not be provided in the upper ends of the connecting links to keep them from becoming disengaged threaded portion I3 is employed, andin theevent Y that the container has the large openingthen the threaded portion I1 is employed to connect my pump to the top of the liquid container.

Mounted within the cylinder Ili` of my pump are two pistons I 9 and 2Il, which` are substantially7 of the same construction. The upper piston is designated by the reference character I9 and the lower piston by the reference character 2U. As illustrated, the upper piston ISgis' connected to the end of a centrally disposed rod 21. The lower end of thefrod 21 is adapted'to slidably move through a guide hole 29 in a bracket 28A which is preferably integrally connected to'the sidewall of the intake housing I2. The lower piston is provided with an' inner sleeve 33 which slidably fits around the rod 2,1 whereby the lower piston 2l! may be" actuated independently of the upper piston I9. Connected to 'thelower end of the sleeve 3i)Y is an actuating lug 3i Vwhic'h'is adapted to be reciprocally' operated bya connecting link 34! froma rocker arm`35'actuated bythe lever 35. The rod 2,1. and the upper piston IEt'are"V also actuated by the rocker arm 35 through means of an actuating, lug.32 connected tofthe bottom end of the rod 21 and an interconnecting link '33 which is connected to the opposite e'nd of the rocker arm to that from which' the connecting link Mis, connected. As, shownv in Figure'3, the L-'shaped lever y346e 'is'constructed of a ir'st portion 31. and a Y second portion 38. Therstp'ortion 31 isadapted to 4be mountedv `for rocking movement -into bearing lugs 4I andV 42 preferablyl constructed integrally with the intake housing, I2.Y The rocker arm 351s non-rotatively. connected to the rst portion 31 of the L-shap'ed lever and is disposed between th'e two bearing lu'gs 4j -and 42. For the purpose'of, clarity, the rocker' arm 35 is not shown in Figure 3. A packing gland nut 39 surroundsl does not interfere with the liquid container andV thus; the pump intake housing I`2 may be connected directly tothe container. f Y

The lower end of the connecting link 33 is providedfwith a right l'angle portion which is'adapted t0 it.' Within an opening inthe yright-hand end ofgthe rockerrarm as shownin Figure 2. A cotterkeyf isemployed to. keepsthe,'cohhvecysing.l

"lower end of the connecting links into the rocker arms prevents this engagement.

` The upper piston I9 which is connected to the upper end of the rod 21 is adapted to rest upon ashoulder 45 provided on the rod 21 and is connected thereto by means of a nut 54. The upper piston I9 comprises a bottom plate 53, an intermediaterplate 55, and atop plate 52. Between the bottom plate 48 and the intermediate plate 59 is a gasket 49 having an annular up-turned iiange which fits against the inside wall ofthe cylinder Ill. The annular up-turned flangetof the gasket 49 may be held against the inside Wall of the cylinder ld Vby means of a suitable wire spring indicated by the reference character 6l) which may be either of a single wire type or a coiled spring type for providing the necessary resiliency. The top plate 52 andthe intermediate plate 58 are held apart by means of al spacer 5I. A washer 53 may be provided under the nut 54 and on top of the top plate 52. Holes 56 may be provided in the intermediate plate 5B which function as valve seats for ballY valves 55 which prevent the back ilow of the liquid through the piston It. Thetop plate 52 may be provided with holes 51 into which the ball valves 55 partially extend, whereby the holes 51 operate as retaining holes to keep the ball valves between the intermediate plate and the top plate. As Huid or liquid ows upwardly through the piston I 9, the ball valves are raised from their seats 55 but when liquid tends to flow backward through the piston I9 the ball valves make seating engagement with the holes 55 for preventing this back flow. The leather gasket e9 and the bottom plate 48 are likewiseprovided with openings 53v and 59 to provideA a passageway for the fluid or liquid to ow through the seats for the ball valves.

Theconstruction of the lower piston 20 is substantially the same. as that of the upper piston I9 and is connected to the sleeve 30 by means ofV In operation, as the rocker arm 35 is rotated.y in

a clockwise direction, the linkage is suchas to cause the upper piston I9 to move downwardly and the lower piston 2),to. move upwardly. As

the upper piston moves downwardly it is merely displaced within the liquid contained within the pump cylinder I4. upwardly itforces the liquid which'ls above the piston` outwardly of the discharge conduit I5 and at the same time draws in liquid from the container Iinto the intake housing I2 and the cylinder which is below the piston.y 20. When' the rocker arm, is rotated ina counter-clockwise direction the mechanical linkage is such as to move the upper. piston lSupwardly and the lower piston 2U. downwardly.Y The movement of the lower y piston 270 downwardly is merely a displacement As the lower piston 20 moves.

of the piston within the liquid, in which case the liquid within the cylinder I4 iiows upwardly through the ball valves into ,the portion of vth'e cylinder above the lower piston 20. 'I'hemovement of the upper piston in an upward direction forces the liquid which is above the piston out through the discharge conduit l5 and atthe same timeproduces a suction for elevating the liquid withinthe cylinder I4 which is below the upper piston I9. Accordingly, my double piston construction is such as to deliver liquid upon each actuation of the actuating lever 36, and thus may be characterized as a double-action pump.Y Th'e guide bracket 28 which stabilizes the lower end of the vrod 21 enables me tobring the two pistons in close proximity with each other without tipping the pistons. Accordingly, the pistons move in a straight line motion sinceY the actual center of the rod 21 is maintained co-axial with the center of` the cylinder I4. In other words, the plane of the pistons is kept perpendicular to the vaxis of the cylinder I4 as the rocker arm is actuated by the lever 3E. By reason of the straight line motion of the piston as effected bythe guide bracket 23, it isto be noted that I am not restricted in the diameter of my pump cylinder since there is no tendency for th'e pistons to tip within the cylinder. Ii they were allowed to tip it would cause leakage of the liquid as well as binding of the pistons within the cylinder. In actual construction, my cylinder and piston may be, of such size and dimension as to deliver the predetermined amount of liquid such, for example, as onev pint-for each rocking travel of the lever arm 35. In assembly, the connecting links and the rocker arm 35 and the actuating lever are rst mounted within the intake housing! 2, after which the rod 2IA and the piston cylinders may be assembled. After the pistons are assembled within the cylinder, then the discharge housing I3 isbolted down by means of the connecting bolts 26.

vAlthough I have described my invention in its preferred form with a certain degree of particu- 'said rod and adapted-tc actuate thesecond piston, a first connecting link for actuating said rod, a second connecting link for slidablyv actuating said sleeve relative to said rod, an L- shaped lever having a first portion and a second portion, means for mounting `the Viirst ,portion in the intake housing for rocking movement, said second portion Yof the L-shapedgleverextending externally of the intake housingvand being disposed for manualA operation, rocker means in said intake housing connected tothe irst portion of the L-shaped lever and having opposite ends adapted. respectively to actuate rthe rst and second connecting links for independently actuating said pistons in the cylinder upon manual movement of the second portion of the L-shaped lever. n y f,

3. A fluid pump, comprising an intake housing, a discharge housing, a cylinder mounted be.- tween .the intake housing and the discharge housing, iirst and second pistons independently operable in the cylinder, a rod for actuating the lirst piston, a sleeve slidablymounted around. said rod and adapted to actuate the second piston, a iirst connecting link for actuating .said rod, a second connecting link for slidably actuating said sleeverrelative to said rod, an L shaped lever having a iirst portion-and a second portion, means for mounting the rst portion in the intake housing for rocking movement, said second portion of the L-shaped lever extendingA externallyoi the intake housing and being. dis..- posed for manual operation, rocker means linsaid larity, it is understood th'at the present disclosure of the preferred form has been made only by way of example and that numerous changes in the details of construction and the combination and arrangement of parts may be resorted to without departing from the spirit and the scope of the invention as hereinafter claimed.

Y What is claimed is: l

1. A fluid pump, comprising an intake housing, a discharge housing,a cylinder mounted between the intake housing and the discharge housing,

a first and a second `piston independently oper.

able in said cylinder, means including a rst connecting link for reciprocally actuating the first piston and a second connecting link for reciprocally actuating the second piston, and an L- shaped lever having a iirst portion4 and a scond portion, means for mounting the iirst portion of the L-shaped lever for rocking movement in the intake housing, said second portion of the lever extending externally of the intake housing and being disposed-for manual operation, rocker means in said intakehousing connected to-the first portion of the L-shaped lever for operating the connecting links and thereby independently reciprocating the pistons within the cylinder.

2. A fluid pump, comprising .an intake housinga discharge housing, a cylinder kmounted between the intake housing and the discharge housinghflst and second pistons independently operable in the cylinder, a rod for actuating the -and a second piston therein, a r-od for actuating the said first piston,l

the L-shaped vlever and having oppositeends adapted respectively to actuate the -iirst and second connecting links forL independently actuating said pistons in the cylinder` upon manual movement ofA the second portion. of the .L- shaped lever, and a bracket connected to the intake housing having an opening therein through' which the said rod slidablyreciprocates foristabilizing the rod, whereby its longitudinalaxis substantially coincides with the longitudinalaxi's of the cylinder. Y,

4. A fluid pump, comprising a cylinder, a iirst independently operable a sleeve surroundingand slidably mountedupon said rod for actuating the second piston, sta-.

bilizing means having Yan opening in which said rod 'slidably moves `for maintaining the reciprocal movements of the rod-in a straight-line motion within said cylinder, and means including `first and `second links for independently actuating said rodkand said sleeve to operate said-pistons independently -in saidcylinden' rst connection nection `means on the vopposite side of said stabilizer means for connecting said second link to piston hub with `sliding engagement therewith, thereby permitting said second piston to be guidsaid sleeve. 1

5. In a fluid pump having a cylinder and a housing at one end thereof, the improvement of a piston arrangement to operate in the said cylinder, said improvement comprising a lirst and second piston mountedv for reciprocatingpumping action, a longitudinally reciprocable rod, a sleeve memberproviding afhub in-said second piston, said rod extending through said second ed by the said rodl but to reciprocateY independently thereof, said rod being secured to said firstl piston and operating"` said `first piston recipro- :incassa cably within said cylinder, centrallysupported guide means tolguide the end of the rod oppo-` site from the end secured to the said rst piston, and aetuatingfmeans having first connection means on one side oi? said guide means-connectedto said rod and second connection means on the. opposite side of said guide means connected to said sleeve memberrfor respectively operating the said rst and second pistons with opposed reciprocating movements within 'said cylinder.

6.-' In a fluid pump having a cylinder and a housingat one end thereof, the improvement of apiston arrangement to operate in the Said cylinder, said improvement comprising a first and second piston mounted for reciprocating pumping action, a longitudinally reciprocable rod, a sleeve member-providing a hub irl-said second piston'said rodextending through said second piston AhubY withk sliding engagement therewith, thereby permitting said second piston to` be guided by the said rod but to reciprocate independently thereof, said rod being secured to'said first piston and operating said first piston reciprocably within said cylinder, guide means extending from the wall of said housing to guide the end of the rod opposite from the end secured to the said iirst piston, Vand actuating means having rst connection means on one side of said guide meansconnected to said rod and second connection Vmeans on the opposite side of said guide means connected to said sleevey member for respectively operating the said iirst and second pistons with opposed reciprocating movements within said cylinder, Vsaid actuating means including rocker means and an L-shaped lever mountedxfor rocking movement in said housing and adapted to oscillate through an angle less than 180degrees.

7. In a iluid pump having a .cylinder and a housing at one end thereof, the improvement of a piston arrangement to operate in the said cylinder, said improvement comprising a rst and Second piston mounted for reciprocating pumpingv action,V a longitudinally reciprocable rod,: a

Vsleeve member providing a hub in said second piston, said rod extending throughY said second pistonhub withv sliding engagement therewith, thereby permittingsaid second piston to be guided bythe said-rod 'but to reciprocate independently thereof,` said rod being securedito said first piston- Vand operating said rst piston reciprocably within-said cylinder, centrally supported guide means ton having an opening through the center thereof, said rod extending through the said center opening of the second piston, said rod being secured' at one end thereof to the iirst piston and disposed to reciprocably move said rst piston, stationary axis rocker means within said intake housing, two extension links extending from said rocker means, one of said extension links serving to operate said center rod and first piston, and the other of said extension links serving to operate the said second piston, said second piston moving reciprocably within said cylinder independently of the direction of longitudinal movement of the said rod but said rod serving as a guide therefor, lever Varm means extending from said rocker means to theexterior of the housing, whereby a rocking motion may be transmitted to the rocker means to operate the pistons, and a discharge opening on the pump barrel chamber on the opposite-end of the chamber from the intakehousing. 1

9. A uid pump comprising a iirst housing, a second housing, a cylinder mounted between the first and second housings, a first and a second piston independently operable in vsaid cylinder, means including a first connecting link for reciprocably actuating the rst piston, and a Second connecting link for reciprocably actuating the second piston, an actuating member having a first portion and a second portion, means for mounting the rst portion of the actuating member for rocking movement in said first housing, said second portion of the actuating member extending externally oi the rst housing and being disposed for manual operation, rocker means in said first housing connected to the first portion of the actuating member for operating .the connecting links, and thereby independently reciprocating the pistons within the cylinderyonerof said housings constituting an intake i. housing having an inlet and the other said housing constituting a discharge housing having a. discharge outlet, said pistons each having a flow passage 1 through which fluid iiows from said intake housto guide the end of therod oppositefrorn. the.

end secured to the said first piston, andactuating means connected-to said rod and said Sleeve member for operating the said first and secondpistons with opposedreciprocating Vmovements within?,-

said cylinder, said actuating, means including,Y an L-shaped ,lever having a iirstr portion. and a sec,- ond portion, means for mounting said rst: portion for rocking movement in said housing, said second portion extending externally of said housing and being disposed for manual operation, and

rocker means mounted on said lirst portion, and,

nrst andsecond connecting links operated-by the rocker means and connected respectively to the.

said rod and to thesaid sleeve member on opposite sides of said guide'means for actuatingv saidpistons with opposed movements within said cylinder. f Y

8. In a pump, an intake housing, a pump cylinder secured to said intake-housing, a first and second piston operable within said cylinder, -a

reciprocable rod extending substantially' along the; u Y l K longitudinal axis ofthe cylinder, said second-"pis- 76 said pistonseach having a ow `passage through* ing tov-said discharge housing, said pistons, connecting links and rocker arm being disposed between said inlet and said outlet.

10. VA pump comprising a rst housing, a second housing, a pump cylinder secured between said housings, a iirst and second piston operable Within said cylinder, a reciprocable rod extending substantiallyalong the-longitudinal axis of the cylinder, said'secon'd piston having a sleeve centrally disposed thereof; said rod extending'through the Vsaid sleeve ofl thel second piston', said rod being securedat one' endgthereof to the first piston and disposedl to. reciprocably move said iirst piston, stationary axis rocker means within said', firstl housing, two extension-links extending from said, rocker means,A jiirst connection means for connecting one of said extension links to said rod for, operating said rst piston, second connection4 means for connecting the other of said-extension links to said sleeveifor operating-said lsecondv piston,vsaid,;second.piston andsleeve moving reciprocably Within said-cylinder independently of the directionoflongitudinal movement ofthe said rod but said rod serving as aguide therefor, cenitrally supported guide means disposed between said rst and secondc'onnection means for-guidingv said rod, actuating means extending from.

9 which fluid flows between said housings, said first and said second housing each having an opening through which fluid flows as said pistons are operated.

11. A pump comprising a rst housing, a second housing, a pump cylinder secured between said housings, a rst and second piston operable Within said cylinder, a reciprocable rod extending substantially along the longitudinal axis of the cylinder, said second piston having a sleeve centrally disposed thereof, said rod extending through the said sleeve of the second piston, said rod being secured at one end thereof to the first piston and disposed to reciprocably move said rst piston, stationary axis rocker means Within said rst housing, two extension links extending from said rocker means, rst pivotal connection means for i0 connecting one oi said extension links to said rod for operating said rst piston, second pivotal connection means for connecting the other of said extension links to said sleeve for operating said second piston, said second piston and sleeve moving reciprocably Within said cylinder independently of the direction of longitudinal movement oi the said rod but said rod serving as a guide therefor, actuating means extending from said rocker means to the exterior of said rst housing, whereby a rocking motion may be transmitted to the rocker means to operate the pistons, said pistons each having a flow passage through which fluid iows between said housings, said rst and said second housing each having an opening through which uid flows as said pistons are operated.

THOMAS D. NISBET. 

